Radeon HD 5870 vs Radeon R9 Nano

Intro

Compare those specs to the Radeon R9 Nano, which comes with a clock frequency of 1000 MHz and a HBM memory frequency of 500 MHz. It also makes use of a 4096-bit memory bus, and makes use of a 28 nm design. It is made up of 4096 SPUs, 256 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano		175 Watts
Radeon HD 5870		188 Watts
	Difference: 13 Watts (7%)

Memory Bandwidth

Performance-wise, the Radeon R9 Nano should theoretically be much superior to the Radeon HD 5870 in general. (explain)

Radeon R9 Nano		512000 MB/sec
Radeon HD 5870		153600 MB/sec
	Difference: 358400 (233%)

Texel Rate

The Radeon R9 Nano is a lot (more or less 276%) faster with regards to anisotropic filtering than the Radeon HD 5870. (explain)

Radeon R9 Nano		256000 Mtexels/sec
Radeon HD 5870		68000 Mtexels/sec
	Difference: 188000 (276%)

Pixel Rate

The Radeon R9 Nano will be a lot (approximately 135%) faster with regards to FSAA than the Radeon HD 5870, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon R9 Nano		64000 Mpixels/sec
Radeon HD 5870		27200 Mpixels/sec
	Difference: 36800 (135%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.